Typewriting machine frame



y 9 v H. A. AVERY 2,007,995

' TYPEWRITING MACHINE FRAME Filed Aug. 17, 1953 v 2 Sheets-Sheet 1 INVENTOR HENRY ALLEN AVERY ATTORNEYS July 16, 1935. H. A. AVERY 2,007,995

TYPEWRITING MACHINE FRAME 7 Filed Aug. 17,. 1933 2' Sheets-Sheet 2 INVENTOR HENRY ALLEN AVERY ATTORNEYS Patented July 16, 1935 UNITED STATES PATENT OFFICE 2,007,995 TYPEWRITING MACHINE FRAME Application August 17, 1933, Serial No. 685,562

'6 Claims. (01. 197-186) This invention relates to improvements in typewriting machine frames and has for its principal objects to provide a light, strong and rigid sheet metal frame for typewriting machines, and to provide a strong and rigid skeleton frame of light construction especially adapted for use in small portable typewriters of the three-quarter or semi-front strike varietywherein the frame is commonly encased in a very thin metal mask or outer casing. Other objects and advantages of the invention will appear from the following descriptionof the preferred embodiment of the invention shown in the accompanying drawings.

In the drawings,

Fig. 1 is a top plan view of the machine frame;

Fig. 2 is a detail view showing in front elevation the left hand front corner of the frame;

Fig. 3 is a vertical longitudinal sectional view of the frame taken on the line 33-of Fig. 1;

Fig. 4 is a fragmentary transverse sectional view of the frame taken on the line 44 of Fig. 3; Fig. 5 is a fragmentary horizontal sectional view of the frame taken on the line 5-.-5 of Fig. 3;

Fig. 6 is a top plan view of one of the rubber 25 feet for the frame;

Fig.7 is a detail perspective view showing the rear portion of the right hand side plate of the frame; and Fig. 8 is a detail perspective view showing the right hand end portion of the rear plate of the frame.

The improved frame, as shown, comprises generally a front end plate III, a rear end plate I I, two side plates I2, an intermediate transverse plate I3, a platen carriage supporting bed plate I4, all formed of sheet metal, and four cushion feet I5 formed of rubber or equivalent resilient material.

The bottom edge of each side plate I2 is substantially straight and each said plate is formed with a horizontal flange l6 projecting outwardly from its bottom edge. Flanges I6 terminate short of the ends of the side plates. Each plate I2 is highest through its middle portion, and the top edge of each plate inclines downward from the higher middle portion of the plate toward both,

ends of the plate to reduced front and rear end portions of the plate respectively designated I2 and I2. Along its forwardly and downwardly inclined top edge each plate I2 is formed with an outwardly projecting flange I1, and along the rear portion of its rearwardly and downwardly inclined top edge each plate I2 is formed with an inwardly projecting flange I8, having an extension I8 of reduced width along the top edge of portion I2 of the plate. Extension l8 terminates short of the rear end of the plate.

The ends of the carriage supporting bed plate I4 are seated on the upper downwardly and rearwardly inclined flat faces of flanges I8, and 5 said plate It is held at each end to the adjacent supporting flange I8 by a pair of screws I9, to support the bed plate in a downwardly and rearwardly inclined plane with the rear edge of the plate approximately at the forward ends of 10 portions I2 of the side plates I2. The bed plate is formed with upwardly extending edge flanges 20 at its forward and rear edges pressed inward toward each other to form raceways for ball bearings upon which the carriage runs.

The intermediate transverse plate I3 of the frame is flat and lies in an upwardly and rearwardly inclined plane perpendicular to the planes in which the flanges I8 and the carriage bed plate It lie. At each of its end edges plate I3 is formed with three projections or lugs 2| which extend outward through holes in the adjacent side plate I2 and are headed over against the outer face of the plate as shown in Figs. 3

' and 4. Plate I3 lies in a plane passing substan- 25 tially through the front edge of plate I4, and the type bar segment and other parts of the machine are supported from the plate I3, with the type bar segment in a plane parallel to plate I3 for striking of the type bars in the known man- 30 ner upon the upper front quarter of the platen.

The rear end plate I I has a forwardly extending horizontal flange 22 at its top edge, forwardly extending vertical flanges 23 at its end edges abutting at their upper ends the end edges of flange 22, and a forwardly extending horizontal flange 24 at its bottom edge projecting slightly outward beyond flanges 23 and engaging under the bottom edges of said flanges 23. The rear ends of end portions I2 of the side plates I2 overlap and are held to the outer faces of flanges 23 of the rear end plate II by two pairs of'vertically spaced screws 25, one pair for each side plate, and the projecting ends of flange 24 extend under these fastened end portions I2 of plates I2.

The front end plate III has a rearwardly extending horizontal flange 26 along its bottom edge, and has a rearwardly extending horizontal flange 21 along its top edge. At its ends, flange 21 is provided with downwardly bent end portions or lugs 28 lying in fore and aft extending vertical planes, which lugs abut the inner faces of front end portions I2 of the side plates I2. The body portion of plate III has rearwardly bent end portions or lugs 29 lying fiatwise against the inner faces of lugs 28. Part l2 of each plate l2, and the adjacent lugs 28 and 29, are all clamped together by a screw 30, and part I2 of each plate I! and the adjacent lug 28 are further clamped together by two screws 31 and 32.

Between flange 26 and the front end of flange l6, and also betweenflange 24 and the rear end of flange l6, each side plate is formed with an inwardly extending lug 33 which lies flatwise in a horizontal plane and is provided with a keyhole shaped slot 34 open at the inner end edge of the lug. To each of these lugs 33 is detachably held one of the four rubber feet for the frame. Each foot l5 has a main bottom portion in the form of a truncated pyramid with a square base. From the main portion of the foot rises a short reduced cylindrical neck portion I5 which corresponds in height to the thickness of lug 33 and carries a head I5 Neck i5 is forced into the rounded inner end portion of slot 34, and head l5 engages over the top of lug 33. At its front and rear edges, each lug 33 is provided with a pendent finger 35, the two fingers 35 of each lug abutting or gripping the front and rear faces of the main body portion of the attached foot l5.

Plate I3 is provided at its top edge with two rearwardly extending lugs 36 engaged flatwise under the carriage bed plate H at points widely spaced from each other and from the side plates l2. Each lug 36 is held by a screw 31 to the bed plate I4. Plates l3 and H are thus connected intermediate the side plates for mutual support and for added rigidity of the frame.

The flanged plates and their connections with each other produce a very light but exceedingly strong and rigid frame, a frame so sturdy that its weight may be reduced by cutting away much of the metal as, for example, in themanner shown. The feet l5 are also so held to the metal framework that they may be firmly secured against accidental derangement or detachment, but may be pulled out or pushed into place when desired. The foot holding means is also of such construction as to relieve the rubber of much lateral strain when the machine is shifted along a surface such as a table or desk top. The flanges on the side and end plates serve to stiffen the frame. Certain of these flanges support the carriage bed plate. The bottom flanges on the side and end plates also afford convenient means on the frame for attachment to the frame of a suitable ornamental casing or mask.

What I claim is:

1. In a typewriting machine, a main part-supporting frame therefor comprising upstanding sheet metal side plates, upstanding sheet metal front and rear end plates extending between the side plates and of less height than the maximum height of the side plates, the side plates having reduced front and rear end portions and being of maximum height intermediate their ends and tapering at their top edges toward said reduced end portions of the side plates, the end plates being attached to the reduced end portions of the side plates, a sheet metal cross plate extending between the side plates intermediate the reduced rear end portions and the high intermediate portions of the side plates, said cross plate lying in an upwardly and rearwardly inclined plane and being attached at its ends to the side plates, the side plates having edge flanges along their downwardly and rearwardly tapered top edges, and e downwardly and rearwardly tilted sheet metal bed plate attached to said flanges for supporting a platen carriage, the front edge of said bed plate lying approximately in the plane of said cross plate.

2. A main part-supporting frame for typewrit ing machines comprising upstanding sheet metal side plates, upstanding sheet metal end plates to which the side plates are attached at their ends, an upstanding sheet metal cross plate extending between the side plates in the rear half of the frame and attached at its ends to the side plates, and a sheet metal carriage-supporting bed plate lying in a plane perpendicular to the cross plate, said bed plate being attached at its ends to the side plates and extending across the top of the frame with its front edge substantially in the plane in which the cross plate lies.

3. A main part-supporting frame for typewriting machines comprising sheet metal side and end plates, a sheet metal cross plate connected at its ends to the side plates and lying in an up and down extending plane, each of said side plates having a laterally extending projection along its top edge, said cross plate having at its top edge rearwardly extending lugs spaced from each other and from the side plates and the projections on said side plates, said lugs and projections lying in a common plane, and a sheet metal carriage-supporting bed plate seated on said lugs and projections and attached thereto.

4. A main part-supporting frame for typewriting machines comprising upstanding sheet metal side and end plates attached at the frame corners, an upstanding sheet metal cross plate extending between the side plates in the rear half of the frame and attached at its ends to said plates, and a sheet metal carriage-supporting base plate supported by and attached to said side plates and cross plate.

5. A main part-supporting frame for typewriting machines comprising a pair of upstanding sheet metal side plates, front and rear end plates detachably attached to the side plates at the frame corners, an upstanding sheet metal cross plate extending between the side plates in the rear half of the frame below the upper edges of said plates, and a sheet metal carriage-supporting base plate supported by said side plates and cross plate and detachably attached to said side plates and cross plate, said cross plate having projections at its ends penetrating the side plates to support the cross plate.

6. A main part-supporting frame for typewriting machines comprising upstanding sheet metal side and end plates attached at the frame corners, an upstanding sheet metal cross plate extending between the side plates in the rear half of the frame below the upper edges of said plates, and a sheet metal carriage-supporting base plate supported by said side plates and cross plate, said cross plate having projections at its ends penetrating the side plates and headed against the outer faces of the side plates for supporting the cross plate from the side plates, the side plates having inwardly extending projections at their top edges and the cross plate having rearwardly extending projections at its top edge, and the bed plate being seated upon said inwardly extending projections and rearwardly extending projections and attached to said projections.

HENRY ALLEN AVERY. 

